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    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>日志框架 - 交互式测验</title>
      <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');
        
        body {
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          color: #333;
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          justify-content: center;
          align-items: center;
          min-height: 100vh;
          margin: 0;
          padding: 20px;
          box-sizing: border-box;
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        .main-wrapper {
            position: relative;
            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
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          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
          width: 100%;
          max-width: 700px;
          overflow: hidden;
          z-index: 10;
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        .quiz-header {
          background-color: #4a90e2;
          color: white;
          padding: 20px 30px;
          text-align: center;
        }

        .quiz-header h1 {
          margin: 0;
          font-size: 24px;
          font-weight: 700;
        }
        
        .quiz-header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
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        #progress-indicator {
            height: 100%;
            width: 0%;
            background-color: #4caf50;
            border-radius: 5px;
            transition: width 0.3s ease;
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        #question-container {
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        #question-text {
          font-size: 18px;
          font-weight: 500;
          line-height: 1.6;
          margin-bottom: 25px;
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        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
          background-color: #f8f9fa;
          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
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        #next-btn {
            background-color: #28a745;
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        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
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        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
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        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
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        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
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        .result-box h3 {
            margin-top: 0;
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        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
        }
        
        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        .score-card p {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
            color: #333;
        }
        .score-details table {
            width: 100%;
            font-size: 16px;
        }
        .score-details td {
            padding: 4px 0;
        }
        .score-details td:last-child {
            text-align: right;
            font-weight: 700;
        }
        .report-actions button {
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 8px;
            padding: 12px 25px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 10px;
            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
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        .report-actions button:hover {
            background-color: #f1f1f1;
            border-color: #bbb;
            transform: translateY(-2px);
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            color: white;
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        .report-actions button.primary:hover {
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        .hint-container {
            background-color: #e0f7fa;
            border: 1px solid #b2ebf2;
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>日志框架 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "根据文档中对log4j日志级别的描述，哪个级别用于指代那些可能导致应用程序退出的严重错误事件？",
    "options": [
      "ERROR",
      "FATAL",
      "WARN",
      "DEBUG"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档中明确指出，FATAL级别用于“指出每个严重的错误事件将会导致应用程序的退出。这个级别比较高了。重大错误，这种级别你可以直接停止程序了。” 而ERROR级别虽然也指错误事件，但系统仍能继续运行。",
    "source": "文档中「日志信息级别」部分",
    "hint": "这个级别的日志代表了最严重的错误，通常是程序无法从中恢复的。"
  },
  {
    "question": "文档中提到了“日志门面”（Log Facade）的概念，例如SLF4J和JCL。它们的核心作用是什么？",
    "options": [
      "提供一套统一的日志API接口，使得应用程序可以与底层具体的日志实现（如Log4j, Logback）解耦。",
      "它们是功能完备的日志实现框架，负责将日志写入文件或控制台。",
      "作为性能优化工具，专门用于提升日志记录的速度。",
      "提供一个可视化的Web界面，用于实时查看和分析日志。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "日志门面（如JCL和SLF4J）只提供一套通用的日志API，本身不包含具体的日志记录实现。这种设计允许开发者在编码时面向接口编程，在运行时可以灵活地切换底层的日志实现框架（如从Log4j切换到Logback），而无需修改任何应用代码。",
    "source": "文档中「3.4 JCL」和「3.5 Slf4j」部分",
    "hint": "思考一下为什么要有JCL或SLF4J这样的“中间层”，它们解决了什么问题？"
  },
  {
    "question": "在配置Log4j时，如果希望日志文件能够根据文件大小进行分割（例如，当文件达到2KB时自动创建新文件），应该使用哪种Appender？",
    "options": [
      "org.apache.log4j.DailyRollingFileAppender",
      "org.apache.log4j.FileAppender",
      "org.apache.log4j.RollingFileAppender",
      "org.apache.log4j.ConsoleAppender"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档中明确说明 `org.apache.log4j.RollingFileAppender` 的功能是“文件大小到达指定尺寸的时候产生一个新的文件”。而 `DailyRollingFileAppender` 是按天分割，`FileAppender` 仅输出到单个文件，`ConsoleAppender` 输出到控制台。",
    "source": "文档中「4.2  Appender 参数值」和「4.7 按照文件大小产生文件」部分",
    "hint": "文档中有个表格清晰地列出了不同Appender的功能，其中一个专门用于按文件大小滚动。"
  },
  {
    "question": "文档提到Logback是Log4j的“升级版”，并且与SLF4J有紧密的关系。下列哪个选项最准确地描述了Logback与SLF4J的关系？",
    "options": [
      "Logback是SLF4J的前身，后来被SLF4J所取代。",
      "Logback是一个为SLF4J提供原生实现的日志框架，旨在成为SLF4J的最佳搭档。",
      "SLF4J是Logback的一个可选插件，用于增强其性能。",
      "Logback和SLF4J是两个完全独立且功能重叠的竞争项目。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档指出，Logback由Log4j的作者创建，旨在成为一个性能更优的继任者。最关键的是，它“是完美实现了SLF4J”的日志产品，这意味着它从设计之初就遵循了SLF4J的API规范，是SLF4J接口的一个原生、高效的实现。",
    "source": "文档中「3.6 Logback」部分",
    "hint": "Logback和SLF4J的作者是同一个人，思考他创造Logback的初衷是为了解决什么问题。"
  },
  {
    "question": "在Spring Boot项目中使用Logback时，如果希望Logback的配置文件能够读取并使用Spring Boot的`application.yml`中定义的属性，需要遵循什么约定？",
    "options": [
      "必须在`application.yml`中通过`logging.config-properties.enable=true`来显式开启。",
      "需要将Logback的配置文件命名为`logback-spring.xml`。",
      "必须使用`@Value`注解在XML配置文件中注入Spring属性。",
      "必须将Logback的配置文件放在`static`目录下而不是`resources`目录。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档在最后一部分特别强调，为了让Logback能够解析Spring的配置（例如使用`<springProfile>`或`<springProperty>`），必须将配置文件从`logback.xml`重命名为`logback-spring.xml`。这是因为Spring Boot会根据这个特定的文件名来改变日志系统的加载时机，确保在解析日志配置前，Spring环境已经准备就绪。",
    "source": "文档中「logback读取Spring配置信息」部分",
    "hint": "文档中提到，如果使用默认的文件名，Logback会比Spring更早加载，从而导致一个问题。"
  },
  {
    "question": "根据文档，为什么Spring Boot默认并推荐使用Logback作为其日志系统？",
    "options": [
      "因为Logback是唯一支持XML配置的日志框架。",
      "因为Logback的效率显著高于log4j，并且是为SLF4J原生设计的。",
      "因为Logback是Java JDK内置的日志系统，无需额外依赖。",
      "因为Log4j已经停止维护，不再可用。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档在「SpringBoot+Sl4j+Logback」章节的引言中明确指出：“推荐使用logback，因为logback的效率显著高于log4j，而且logback也是Springboot推荐并且默认使用的日志系统。” 这概括了其性能优势和与现代Java生态（特别是SLF4J）的良好集成。",
    "source": "文档中「SpringBoot+Sl4j+Logback」部分",
    "hint": "Spring Boot的选择通常基于性能、社区活跃度和与核心生态的集成度。"
  },
  {
    "question": "在logback的配置文件中，`%d`, `%thread`, `%-5level`, `%msg%n` 这些占位符的作用是什么？",
    "options": [
      "用于定义数据库连接信息。",
      "用于在日志输出中格式化信息，分别代表日期、线程名、日志级别、日志消息和换行符。",
      "是用于导入其他XML配置文件的特殊指令。",
      "用于配置日志文件的滚动策略参数。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "这些占位符是日志格式模式（Pattern）的一部分。文档中对这些占位符进行了解释：`%d`（或`%date`）表示日期，`%thread`表示线程名，`%-5level`表示左对齐且固定宽度的日志级别，`%msg`表示日志消息本身，`%n`表示换行符。它们共同定义了每条日志信息的输出格式。",
    "source": "文档中「5.1.2 配置文件」部分的pattern说明",
    "hint": "这些符号出现在`<pattern>`或`<encoder>`标签内，用于控制日志输出的最终样式。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  